Grinding-machine.



A. B'. FOWLER. GRINDING MAGHIN-E.

APPLICATION FILED NOV. 2'7, 1907. RENEWED JAN. 18- 1912.

Patented Mar. 12,1912.

I/WTNESSESC UNITED STATES PATENT OFFICE.

ALFRED n. FOWLER, or nos'ron. mnssacnusnrrs, ASSIGNOB- 'ro UNITED SHOE MACHINERY COMPANY, or PATEBSON, NEW JERSEY,- A CORPORATION or NEW JERSEY.

GRINDING-:MACHINE.

Specification of Letters Patent.

Patented Mai-r. 12, 1912.

Application filed November 27, 1907, Serial No. 404,123. Renewed January 18, 1912. Serial No. 671,884

T all wlw'r/i it may concern:

Be it known that I, Anrnizn B. Fown'eu, a citizen of the United States, residing at Boston, in the county .01 Suifolk and Commoir wealth of ll'lassachusetls, have invented certain Improvements in Grinding-lllachines,

" 'of'lu'hicli'th'c followingdescription; in connection with the acconi mnymgdrawings, is

' a specification, like re erence characters on the drawings indicating like parts in the several figures.

This invention relates to grinding machines and more particularl to machines for grinding heel breast-lug nives such as are employed in the manufacture of boots and shoes.

A heel broaslginglmife has a concave cut ting edge and the blade of the knife is usually of a. cylindricall'y curved contour. The end of the blade is beveled upon the concave side to form the cutting edge;

The primary object of the invention is to provide mechanism adapted to insure an accurate grinding operation in grinding articles of this form.

Thr; invention ill behereinafter described with reference to the grinding of hcel-breasting knives, but it will be understood that it is not necessarily limited to this particular use. I According to the present invention sue.-

eessive portions .of the surfaeeto be ground a subjected to the action of a constantly moving grinding device by relative move ment of the blade and said device, adapted to shift the blade along said surface The relative movementof these elements is so.

controlled as to insure the production of a concavity of a predetermined curvature in the ed 6 of the blade.

To t is end unimportant feature of the invention consists in mechanism for con- -trolling said relative movement adapted to cause the action of the grinding device upon said edge to be, exerted at all times longitudinally of the blade, or in a plane through the axis of the blade. This feature is of advantage not only in avgoiding grinding ofi .unduly the'corners of knives, an effect which is occasioned.'whe're the inding device moves oblitfiuely along. the b Mic, but also in that it ten sto secure-a bevel of uniform width 'at points intermediate thccorners. It

will be understood that the production of a,

bevel fqfiwidth is desirable, since such :a' on variation in its width along the cutting edge renders difficult the production and maintenance of a predetermined concavitv in the edge. The acting part of the grinding device movesat a predetermined angle; to the axis of the blade to-procluce a bevelot a desiredfangle and this angular'relation "of the blade to the grinding device is main tained substantially the some in grinding all parts of-the cutting edge;

I prefer to use ,as a'grinding device a wheel mounted to rotate about a stationary axis. The arrangement is such that the knife to be ground is moved by hand across the faceof the wheel, the axis of the blade being mechanically maintained at all points in its movement pa-rallel'to the plane of the wheell The path of the blade is also such that in its movement across the wheel the portion of the cutting edgeacted upon lies at all times in substantially the same portion of the path of the acting part of the wheel. The arrangement is accordingly such, that iu'grinding from one corner tothe. middle of the edge the kuifeis moved progressively in a direction approximately tangentially of the wheel toward the point at which it is desired. the grinding action shall be elieoted, while in grinding the remaining halfgo-f the ifromsaidgioint To permit'thersurfaeo-being groun to engage nut-times su'b'sta'ntially the same mint-in the width-of them arranged for swinging movement in a plane plsfallel with the'plane of the wheel. A 'fe holder is sustained upon said member by means of a parallel motion connection adaptcdtofpermit movement of the holder across the ace of the wheel and arranged to maintain the holder in a vertical position, viewed from in"-front of the wheel. A convenient construction comprises .two mrallel t-OTSlll 'ivotellygconn otedm the 1101 er'and member-fund having the some eflec--' tive le ul. sri eatuii'ls m preferably-of gth-that the holder moves in a path of substantially the some curvature as the concavi of the l'mife. To permit knives having cutting-edges of diflferent degrees of.

'tiveof the mac concavity to be ground, the arrangement is such that the e ective length of-the links may be ad'usted. The curvature in the path of the hol er is op 'osite to that of the edge of the knife carrie by the holder and compensat'es for theconcavity of the latter, so that inthegrindin'g operation the portion of the cutting'edgp acted upon remains at all times-in substantially the same part of the path of the wheel. I

Other features of the invention will be hereinafter described and defined in .the

- claims.

In the drawings which illustrate a machine constituting one embodiment of the invention,--Fi re 1 is a. view in perspecine; Fig. 2 is a. view in side elevation of said machine; and Fig. 3 illus trates a form of tool which may be ground by the machine.

Referrin to the drawings, 1 indicates a grinding w eel supported for-rotation about a horizontal axis ;u on any convenient support the surface 0 said wheel being preferably transversely curved, and of a greater convexitydhan the cylindrical surface of the blade. Tdthe underside of said support is secured a bracket 2 provided with a hori zontal guideway arranged at right angles to the axis of the wheel 1 and adapted to receive a rod '4, said rod being splnied in said guideway. In the forward forked end of the rod 4. is pivot-ally--:1nounted for movethe upper g for retaining a knife in the holder.

'tained in the-sleeve by en a the sleeves 14: are

'with the axis ofthe arm To permit the angle of hevel formed upon -the knife to be controlled, the rod men't abouta horizontal axis, parallel to the axis of the wheel 1, a sleeve 6. In the sleeve 6- 1s received an arm 8 -pr ovided with a-col-' lar 10 adjustablyfsecured thereon. The arm 8 is free to turn in the sleeve 6 and is susemcnt of the Bulls-r 10 with said sleeve. pon the upper" end ofthe arm Bis secured a cross piece 12 rovided with transverse'bores at each end. 1; said bores are arranged the stems of sleeves 14, arranged for pivotal movement of themahine. ,As w ll appear 2 a knife secured in the hoder 22 is parallel rangedfor adjustment in the bracket 2. It

wheel 1 and in its movement said holder remains at all times .m a vertical position; viewed from the front from Fig.

have illustrated a screw 26 arranged to facilitate adjustment of said rod'in its guideway. 4

Tn the operation of the machine above described, the parts are first adjusted in ac cordance with the form of the knife to be ground. The links 18 are adjusted in the sleeves l l, so that their effective length is approximately equal to the radius of the concavity desired in the ed e of the knife. The arm 8 ma be adjusts in the sleeve 6 to bring the e ge of theknife at any par-- ticular elevation, and the screw 26 may be manipulated to provide a proper angle between the knife and the face of the wheel to produce a desired angle of bevel.

The parts being roperly adjusted, the grindin operation 15 effected by moving the kni e holder manually across the face of the wheel, pressing the knife against the wheel and turning the holder slightly to cause the knife at all times to have contactwith the wheel at substantially the median line on its periphery. Itwill be observed that the wheel moves at all times substantially longitudinally of the blade and that the portion of the edge acted-upon atall times lies in substantially the same part of the wheels path. The angular relation which the knife bears to the wheel remains substantially unchanged in the grinding operation. The bevel formed upon the blade is therefore substantially uniform in width from point -ito point in its length and the production of a predetermined curvature in the edge of the knife is insured. The knife is preferably arranged at such anangle to the wheel that its convex side is tangent to blade used above the wheel, as shown in Fi The term axis of' the and'also employed hereinafter in the claims is intended to mean the axis of the cylinder.

of which the blade of the knife constitutes a portion. It will also be understood that by the term concavity as referred to the edge of the knife is meant its contour viewed in front orrear elevation for example as illustrated in Fig. 3.

Having described my invention, what I claim as newand desire to secure by Letters Patent of the UnitedStat'es is '1. A machine for grinding a'concave edge upon a blade having, in combination, a

indingwhee and means for guiding the lade across the face of the wheel in a ath having an opposite curvature to that o the concave edge of the blade whereby the grm 'predetennined part'of the path of thewheel, said means constructed to maintain the axis of the blade in asubstantially parallel relation to the wheel. 2. 'A machine for grinding )a concave edge upon a cylindrically curved lade, having m dingraction is effected at all times ata plane of movement of the.

combination, a grinding wheel arranged tobe continuously actuated, means for receiv ing and sustaining a blade, said wheel and sustaining'means being arranged for relative movement to sub'ect different portions of the blade to the action of said wheel, and

- means for controlling said relative movement constri'icted to cause the action of said wheel upon-the blade to be exerted at all times substantiall' longitudinally ofv the blade and to be e ected ata predetermined paltof the ath of the wheel.

- *3. A mac ine for grinding a concave edge upon acylindrically curved blade, having in combination, a' grinding wheel, and a holder for guiding the blade across the face of the i wheel arranged to maintain the axis of the blade in a substantially parallel relation to ,.4. A-machine for the plane of movement of the wheel and constructed to cause the grinding action to be effected at all times at a predetermined of the blade in a substantially parallel relation to the plane of movement of the wheel and to permit movement of said blade about a longitudinal axis.

'5. A machine for grinding a concave edge upon a cylindrically curved blade, having in combination, a grinding wheel, a member arranged for movement about an axis parallel to that-of the wheel and held from movement laterally of the Wheel, a blade holder, and a lurality of parallel links pivotally mount e upon said member, pivotally connected to the holderand having a predetermined efiective length.

6. A machine for grinding a concave edge upon a blade, having, in combination, a grinding wheel and means for guiding the blade across the face of thewheel in a path. having an opposite curvature to that of the concave edge of the blade, said means having provision for adjustment whereby the curvature of said path may be varied to correspond with knives having difi'erent concavities in their cutting edges.-

,.7. A machine for upon a blade, having, in combination, a grinding wheel and means for guiding the blade across the face ofthe wheel in a path having an opposite curvature to that of the concave edge of the blade having provision for adjustment whereby the curvature of said path maybe varied to correspond with knives having different concavities in their cutting edges, said means being constructed to maintain the axis of the blade in a substantially parallel relation -to the plane of movement of the wheel.

8. A maohine for grinding a concave edge upon a blade, having in combination, a

grinding wheel and means for guiding the blade across the face of the wheel in a path having an opposite curvature to that of the concave edge of the blade having provision for adjustment whereby the curvature of said path may be varied to correspond with knives having ditferent concavities in their cuttin edges, said means being constructed to maintain the axis of the blade in a substantially parallel relation to the plane of movement of the wheel and to permit movement of said blade about a longitudinal axis.

9. A. machine for grinding a concave edge upon a transversely curved blade, having in combination, a grinding Wheel and a holder- 't'or supporting a. blade to be ground arranged tobe manually moved across the face of the Wheel andmeans for guiding the holder constructed to maintain the axis of the blade in a substantially parallel rela- 'tion to the plane oi" movement of the wheel and to permit movement of said blade about a longitudinal axis.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED B. FOWLER.

Witnesses: i

BERNARD BAnRoWs, ALLAN Bmnows.

copies of this patent may he obtained for five cents each, by addressing the fGommissioner of Eatents,

- Washington, D12. I

'nding a concave edge 

